US 12,085,628 B2
Signal processing method, program, and signal processing system
Hideaki Fujiura, Osaka (JP); and Yoshiyuki Saito, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/774,791
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Nov. 5, 2020, PCT No. PCT/JP2020/041421
§ 371(c)(1), (2) Date May 5, 2022,
PCT Pub. No. WO2021/095641, PCT Pub. Date May 20, 2021.
Claims priority of application No. 2019-204208 (JP), filed on Nov. 11, 2019.
Prior Publication US 2022/0404442 A1, Dec. 22, 2022
Int. Cl. G01R 33/09 (2006.01)
CPC G01R 33/09 (2013.01) 14 Claims
OG exemplary drawing
 
1. A signal processing method for use in a signal processing system, the signal processing system including:
a first magnetic detection unit configured to output a sine signal corresponding to an angle of rotation of a detected magnetic field;
a second magnetic detection unit configured to output a cosine signal corresponding to the angle of rotation of the detected magnetic field and having a phase difference of π/2 from the sine signal; and
a processing unit configured to output, based on at least one of the sine signal or the cosine signal, an angle signal including angle information about the angle of rotation of the detected magnetic field and a failure signal including failure information about a failure of at least one of the first magnetic detection unit or the second magnetic detection unit,
the signal processing method comprising:
an angle calculating step including transforming, by using an inverse trigonometric function, the sine signal, the cosine signal, and a tangent signal based on the sine signal and the cosine signal into a first angle signal serving as the angle signal, a second angle signal, and a third angle signal, respectively; and
a failure diagnosis step including making a failure diagnosis of the first magnetic detection unit and the second magnetic detection unit by comparing with each other two or more pieces of angle information selected from the group consisting of first angle information included in the first angle signal, second angle information included in the second angle signal, and third angle information included in the third angle signal,
wherein the failure diagnosis step includes making the failure diagnosis by comparing either the first angle information or the second angle information with the third angle information.